<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container">
      <div @mouseleave="moveOutDiv" @mouseenter="isShow=true">
        <h2 class="all">全部商品分类</h2>
        <transition name="sort">
          <div class="sort" v-show="isShow">
            <div class="all-sort-list2" @click="toSearch">
              <div
                  class="item "
                  :class="{item_on:currentIndex===index}"
                  @mouseenter="moveInItem(index)"
                  v-for="(c1,index) in categoryList"
                  :key="c1.categoryId"

              >
                <h3>
                  <!--                <a href="">{{c1.categoryName}}</a>-->
                  <!--                <router-link :to="{-->
                  <!--                  name:'search',-->
                  <!--                  query:{categoryName:c1.categoryName,category1Id:c1.categoryId}-->
                  <!--                }" href="javascript:;">{{c1.categoryName}}</router-link>-->
                  <!--                <a @click="$router.push({-->
                  <!--                name:'search',-->
                  <!--                query:{categoryName:c1.categoryName,category1Id:c1.categoryId}-->
                  <!--                })" href="javascript:;">{{c1.categoryName}}</a>-->
                  <!--                时间委派  -->
                  <a :data-categoryName="c1.categoryName" :data-category1Id="c1.categoryId"
                     href="javascript:;">{{ c1.categoryName }}</a>
                </h3>
                <div class="item-list clearfix">
                  <div class="subitem">
                    <dl class="fore" v-for="(c2,index) in c1.categoryChild" :key="c2.categoryId">
                      <dt>
                        <!--                      <a href="">{{c2.categoryName}}</a>-->
                        <!--                      <router-link :to="{-->
                        <!--                  name:'search',-->
                        <!--                  query:{categoryName:c2.categoryName,category2Id:c2.categoryId}-->
                        <!--                }" href="javascript:;">{{c2.categoryName}}</router-link>-->
                        <!--                      <a @click="$router.push({-->
                        <!--                name:'search',-->
                        <!--                query:{categoryName:c2.categoryName,category2Id:c2.categoryId}-->
                        <!--                })" href="javascript:;">{{c2.categoryName}}</a>-->
                        <a :data-categoryName="c2.categoryName" :data-category2Id="c2.categoryId"
                           href="javascript:;">{{ c2.categoryName }}</a>
                      </dt>
                      <dd>
                        <em v-for="(c3,index) in c2.categoryChild " :key="c3.categoryId">
                          <!--                        <a href="">{{c3.categoryName}}</a>-->
                          <!--                        <router-link :to="{-->
                          <!--                  name:'search',-->
                          <!--                  query:{categoryName:c3.categoryName,category3Id:c3.categoryId}-->
                          <!--                }" href="javascript:;">{{c3.categoryName}}</router-link>-->
                          <!--                        <a @click="$router.push({-->
                          <!--                name:'search',-->
                          <!--                query:{categoryName:c3.categoryName,category3Id:c3.categoryId}-->
                          <!--                })" href="javascript:;">{{c3.categoryName}}</a>-->
                          <a :data-categoryName="c3.categoryName" :data-category3Id="c3.categoryId"
                             href="javascript:;">{{ c3.categoryName }}</a>
                        </em>
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </transition>
      </div>

      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>

    </div>
  </div>
</template>

<script>
import {mapState} from 'vuex'
import throttle from 'lodash/throttle'

export default {
  name: "TypeNav",
  data() {
    return {
      currentIndex: -1,//设置一个参考值 index 索引从0开始 currentIndex初始值为-1 就为隐藏
      isShow: true
    }
  },
  mounted() {
    //发送请求放在app组件中只有请求数据就一次 放在不动的组件中 不需要多次 因为都放入vuex中 谁需要直接去拿就可以了
    // this.getCategoryList()
    //如果跳转到不是home组件 就不展示item
    if (this.$route.path !== '/home') {
      this.isShow = false
    }

  },
  methods: {
    //发送请求一次即可 不需要重复多次 放入APP组件中 一般放入固定的组件中请求 谁需要数据就从vuex中获取即可
    // getCategoryList() {
    //   // console.log(this)
    //   this.$store.dispatch('getCategoryList')
    // },
    moveOutDiv() {
      this.currentIndex = -1
      //离开的时候 一级列表隐藏
      if (this.$route.path!=='/home'){
        this.isShow=false
      }
    },
    //节流之后
    moveInItem: throttle(function (index) {
      // console.log(index)
      this.currentIndex = index
    }, 20, {trailing: false}),
    //点击三级分类 跳转到search页面
    toSearch(event) {
      let dataset = event.target.dataset//把元素身上的以data-开头的属性和属性值全部收集到dataset对象中
      // console.log(dataset)
      //dataset解构赋值 所需要的东西不一定能拿到,
      //如果点击a标签那么可以拿到2个 categoryname和某个categoryid
      //如果点击的不是a标签,那么就拿不到任何值,拿到4个undefined
      const {categoryname, category1id, category2id, category3id} = dataset
      if (categoryname) {
        //代表点击了a标签,因为只有a标签有这个属性
        let location = {
          name: 'search'
        }
        let query = {
          categoryName: categoryname
        }
        if (category1id) {
          query.category1Id = category1id
        } else if (category2id) {
          query.category2Id = category2id
        } else {
          query.category3Id = category3id
        }
        location.query = query
        //判断是否携带params参数如果有需要合并
        if (this.$route.params){
          location.params=this.$route.params
        }
        this.$router.push(location)
      }
    }
  },
  computed: {
    ...mapState({
      categoryList: state => state.home.categoryList
    })
  }
}
</script>

<style lang="less" scoped>
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      &.sort-enter{
        opacity: 0;
        height: 0;
      }
      &.sort-enter-active{
      transition: all 1s;
      }
      &.sort-enter-to{
        opacity: 1;
        height: 461px;
      }
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          &.item_on {
            background: orangered;

            .item-list {
              display: block;
              color: #333333;
            }
          }
        }
      }
    }
  }
}
</style>